A lithophane is a three-dimensional image that changes according to the intensity and quality of the light striking it. The light areas are very thin, allowing more light to pass through, while the thicker parts appear darker.
Lithophanes date back to the 1800s, when they were traditionally carved from wax, molded in plaster, then cast and fired in porcelain. In the meantime, photography was invented as a simpler way to capture an instant, but now, 3D printing enables you to experience the best of both worlds.